In 1986 Miles Davis stopped his band to kick an uninvited Wynton Marsalis off of the stage. He told him twice to "fuck off" and said "Wynton can't play the kind of shit we were playing".

The Jazz Street Vancouver recalls the famous/infamous showdown in 1986 between Miles Davis & Wynton Marsalis at the Expo Theatre during the inaugural Vancouver International Jazz Festival.
“While trumpeter Miles Davis was performing at the Expo Theatre during the inaugural Vancouver International Jazz Festival, a young Wynton Marsalis burst onto the stage unannounced and began playing his trumpet.”
Miles Davis even talks about the confrontation with Wynton Marsalis in his autobiography — p.374-75.
Wynton vs. Miles: